The HB-704 is a four-channel-selectable, full-duplex headset station, able to be mounted into a wall or other surface. This headset station is ideal for installation in theatrical, performance, broadcast, and industrial facilities - wherever a multi-channel, full-duplex headset communications panel is desired.
The HB-704 mounts in a standard US two-gang outlet box. The station covers excellent speech intelligibility even in high noise environments. Microprocessor-controlled logic plus a set of internal and external controls allow the features of the station to be tailored to the needs of the user. Electronic switching for the talk button, blue-color LED (on) or amber-color (o), permits momentary or latching operation. A Remote Mic Kill (RMK) signal on the intercom line will turn o the talk function if it is accidentally left on. A red-color LED tracks the incoming call signal, so it can be used for visual cueing.
An associated call button allows the user to place a call signal on the selected intercom line. The standard 4-pin XLR headset jack accommodates Clear-Com and compatible dynamic headsets. A sidetone level control adjusts the amount of the user’s voice heard in the headset. An automatic limiter circuit adjusts and limits the microphone output to the intercom line. A four-position switch allows the user to select from the attached intercom channels. Connections to the intercom lines are made via a screw-terminal block, using standard two-wire shielded mic cable.
The station may be used with the optional TW (two channels on a single mic cable) daughter board. With the TW board, the station becomes plug-in compatible with a Clear-Com TW system. The HB-704 is housed in a durable package with a steel front panel.
Clear-Com HB-704 Features
- Momentary/Latching Talk switch with LED
- Microprocessor controlled logic and switching
- Visual call signaling
- Headset connector with volume control and sidetone adjust
- Optional 4-wire or TW daughter boards for flexibility
- Mountable into a standard US two-gang outlet box
- HB-704 Encore 4-channel remote headset station1
- Headset Microphone Input
- Input Type: Dynamic
- Input Impedance: >= 1K
- Mic Limiter Threshold: -2dBu ± 3dB
- Mic Limiter Range: >= 15dB
- Program Line Input
- Input Impedance: >= 5K
- Headset Output
- Load Impedance: >= 8
- Output Impedance: <= 25
- Output Limiter Threshold: +5dBu ± 3dB
- Maximum Output Level before Distortion: >= 17dBu
- Partyline Output
- Off Noise: < -74dBu
- Output Impedance: >10K
- Partyline Input
- Crosstalk: < -60dB
- Max level before Clipping: >= 12dBu
- Frequency Response
- Headset Mic – Partyline: 300 – 15kHz ± 3dB
- Partyline – Headset Out: 300 – 15kHz ± 3dB
- Max. Distortion
- Headset Mic – Partyline: <= 0.5%
- Partyline – Headset Out: <= 0.2%
- Noise
- Headset Mic – Partyline: < -70dBu
- Max. Gain
- Headset Mic – Partyline: 41dB ± 2dB
- Partyline – Headset Out: >= 34dB
- Power
- Input Voltage Range: 20-30V DC
- Input Current (Idle): <= 50mA
- Input Current (Max): <=100mA
- Internal Adjustments and Connections
- Intercom Line: Seven terminal connector
- Option Switches: Two DIP switches
- Option Board Jumper: Two sets of options jumpers
- Environmental32°F to 122°F (0°C to 50°C)
- Dimensions (HxWxD)4.5" x 4.6" x 1.75"
- Weight0.46 pounds (0.21 kg)
